red slug arion rufus found by the farmer on a plant. cause o

agriculture animal antenna arion attack biology black body brown contract creatures damage eating enemy european farmer fauna feeding flower fungi fungus garden gardener gardening gastropod green hand invasive invertebrate large leaf macro mollusk mucus natural nature orange outdoor pest plant problem protection pulmonata red roundback rufus science shape slime slimy slippery slow slug snail trouble twisting vegetables wet wild wildlife young